Rod steam-packing.



0. D. H. BENTLEY. BOD STEAM PACKING.

APPLICATION FILED JUNE 15, 1909. 935,955. Patented 001:.5, 1909.

. C i i E K a f 55 FIG. 2.

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INVENTOR [31 Jzlomz'y WITNESSES:

To all whom it may concern:

I UNIT srna ns PATENT OFFICE.

' OIiIVEB D. H. BENTLEY, OF NEW YORK, N. Y., ASSIGNOR TO E. W. BLISSCOMPANY, OF

' BROOKLYN, YORK, A CORPORATION OF WEST VIRGINIA.

ROD STEAM-PACKIN G.

Patented Oct. 5, 1909.

Application filed June 15, 1909. Serial No. 502,287.

Be it known that I, OLIVER-D. H. BENT- LEY, a citizemof the UnitedStates, residing in the boron h of Brooklyn, county of Kings, city anState of New York,'have invented certain new and useful Improvements inRod Steam-Packin of which the following is a specification.

This invention relates to a packing for piston rods, valve rods or thelike, used in connection with steam engines, throttle valves, andelsewhere where steam is the fluid to be packed against.

According'to this invention the'rod is carried from the inner or steamchamber to the exterior, through a close-fitting bore formed in asuitable neck, the fit being a close working fit, so that while the rodmay easily move through the bore, yet the intervening space is so thinas to preclude any butan extremely minute leakage of vision is made forinsuring the condensation of the minute quantity of steam which can leakinto this narrow space. For this purpose the neck through which the rodor stem emerges is fluted, corrugated, 'or otherwise disposed upon itsexterior so as to afford a considerable radiatin surface whereby tocause a sufliciently rapid cooling of the neck;

or, where practicable, the neck is formed with a jacket or passagethrough or surrounding it, for the circulation of a cooling fluid. Bythus causing the condensation of the minute quantity of steam which canen ter a contracted space or clearance between the rod and bore, thisspace is so eflectually packed as to exclude all leakage except aquantity so minute as to be negligible. v

Figure 1 of the accompanying drawin s shows my invention as applied to athrott e valve or overnor valve fora steam turbine or other orm ofsteam. engine, the view being a vertical mid-section. Fig. 2 is afragmentary elevation of the neck portion of the structure shown inFig. 1. Fi 3 is a fragmentary section showin a mo ification.

Referring to Fig. 1, is a casing or shell in which steam is admitted atB, and from which it escapes at C, the shell being formed between witha' artition D. dividing it into two chambers w ich communicate throu hopenings or steam ports E E, in which wor s a balanced valve F of a wellknown con-- struction. The top of. the shell A is closed by a cap orcover G. The valve rod H steam. Proa passes out through this cap, andits upper end may be connected with any operatlng means such, forexample, as a lever I and a spring J- by which to raise and lower therod, and thereby operate the valve. So far do as described this is acommon and well known construction.

Instead of providing a stufling-box, or

other common form of packing for the rod H,

I construct the cap G with a suitably pro- 5 bore 1s reduced to theminimum, not only by 71) the closeness of their fit, but also by makingthe rod of as small diameter as is practicable. The neck K issufficiently long to insure the condensation of the .minute quantity ofsteam which can leak into this clearance. "75.

To insure this condensation the neck is formed exteriorly with asuccession of projections, either in the form of concentrical ribs L Las shown, or in any other manner whereby the exterior surface of theneck '80 which is in contact with the air, is so in-. creased as tosufliciently promote the radiation of heat, and thereby'insure thecondensation of steam in the leakage space or clearance'aroundthe rod.It results from this .85 construction that the infinitesimal quantity ofsteam which can enter this clearance is necessarily condensed therein,and the weight .of the condensation water opposes itself to the upwardleakage of the steam. The con- 90 densation water is very slowly formed,and

slowly works its way upward throu h the clearance space, so that atconsidera le intervals a drop of water is discharged at the top..

neck is shown as screw-threadedto receive an adjustable nut M, wherebyto vary the tension of the spring J; but this forms no part of thepresent invention. 7

Referring to Fig. 3, the shell A, the valve F and the rod H are of thesame construction as shown in Fig. 1; but the cap G is modified, itsneck K being made shorter,

and instead of its exterior being ex osed to 105 the atmosphere for theradiation 0 heat, it is formed with a jacket P surrounding it(preferably as "shown by coring out this jacket in the same casting),and provision is made for causing a circulation of cooling 110 95 I InFigs. 1 and 2 the upper end of the fluid through this jacket P.. Forthis purpose an admission pipe Q and a discharge pipe R, are provided.The cooling fluid may be water or, air under suitable pressure, or anyother suitable or convenient fluid. The length of the jacket P of theneck K should be suitably proportioned with reefficiency. When a givenlength of neck andsize of acket has been determined upon,the coolingmedium must thereafter be maintained of suitable efliciency to cause thecondensation to take place at a desirably rapid rate.

It is important to have the rod or stem extend vertically or nearly soto the packing, the steam chamber being located beneath, so that thegravitation of the condensation Water is rendered eifective in resistingleakage.

I claim as my invention 1. A steam packing, comprising. a neck betweenthe steam chamber and the exterior, and a slender rod passing throughsaid neck, the neck being bored to a close working fit with the rod, andbeing of suflicient length to insure the condensation of any steamleaking into the minute clearance space between the rod and bore wherebywithout other packing means the condensation in said space affords asuflicient obstruction to the escape of steam.

2. A steam packin projecting upwardly trom the steam chamber to theexterior, and a slender upright comprising a neck rod passing throughsaidneck, the neck beminute clearance space between the rod and borewhereby without other packing means the condensation in said spaceaflords a sufficient. obstruction to the escape of steam, and wherebythe gravitation of said condensation is utilized to oppose leakage.

3. A steam packing, comprising a neck between the steam chamber and theexterior, and a rod passing through said neck, the neck being bored to aclose working fit with the rod, and provided withmeans adapted topromote radiation of heat in the neck, to insure the condensation of anysteam leaking into the minute clearance space between the rod and borewhereby without other packing means the condensation in said spaceaffords a sufiieient obstruction to the escape of steam.

4. A steam packing, comprising a neck between the steam chamber and theexterior, and a rod passing through said neck, the neck being bored to aclose working fit with the rod, and provided with external projectionsadapted to promote radiation of heat to.,the atmosphere, to insure thecondensation of any steam leaking into the minute clearance spacebetween the rod and bore whereby without other packin means thecondensation in said space a ords a sufficient obstruct-ion to theescape of steam.

In witness whereof, I have hereunto 'si ed my name in the presence oftwo subscri ing witnesses.

OLIVER D. H. BENTLEY. Witnesses:

EDWIN G. KN'aPP, ARCHIE S. MCLUNDIE.

